Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1608057 | Journal of Alloys and Compounds | 2015 | 7 Pages |
•Evolution of microstructure and texture in NiTi sheets during hot and cold rolling.•Hot rolled sheets exhibit a strong through-thickness texture heterogeneity.•This heterogeneity results from a temperature gradient during hot rolling.•Cold rolling promotes a homogeneous {111}
In the present paper we study the evolution of microstructure and texture during processing of Ni51Ti49 shape memory sheets using electron backscatter diffraction. Hot rolling results in a heterogeneous microstructure which reflects a temperature gradient in the sheet. Equiaxed and randomly oriented grains are observed close to the surface of the hot rolled sheet while the sheet interior shows a strong texture containing two main texture components {111}<110> and {110}<110> with grains elongated along the rolling direction. In contrast, cold rolling in combination with a recrystallization heat treatment produces a more homogeneous microstructure in terms of grain morphology and grain size. It also promotes a random grain orientation along the rolling and transverse directions while the normal direction shows a strong γ-fiber {111}